The purpose of this research was to determine the relationship between physical activity and the age of PHV in children aged 9-11 years. The method used in this research is a test survey with data collection techniques using questionnaires and measurement tests. The population in this research is SSB Tugumuda athletes and grade 4 students at SDN Karangjati 04. The samples were taken from as many as 29 boys from SSB Tugumuda and 23 boys from SDN Karangjati 04 aged 9-11 years. The sampling technique uses purposive sampling. The data analysis technique in this research used the Pearson bivariate correlation test. The results showed that 1) The level of physical activity of 1 child (1.9%) had a "low" level of activity, as many as 18 children (34.6%) had physical activity said to be "sufficient", 32 children (61.5%) with a "high" level of physical activity and 1 child (1.9%) had a "very high" level of activity, 3) The average age of PHV in 52 respondents was 14.02 years. It was concluded that there was a relationship between physical activity to the age of PHV in the 2 groups.
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